about cyclone 10gx transceiver

Hi, recently I am trying to debug cyclone 10 gx transceivers, and the settings are as the figures above.

After reseting, I first send 32'h12345678 as the control world, and set tx_control[1:0] = 2'b10. During this time, in my logic I using rx_bitslip to slip the bits until rx_parallel_data is equal to 32'h12345678. After that, I continually send incremental counter value through transmitter with tx_control[1:0] = 2'b01, but the receiver gets rx_control[1:0] equal to 1, 2, 3, changing all the time, which is shown as following figure.

So, did I set parameters wrongly? Or how can l solve it? Thank you.